add end-to-end tests

tests/Dockerfile

@@ -0,0 +1,17 @@
+# pushed as costela/wesher-test to speed up testing
+
+FROM golang:1.12-alpine
+
+RUN apk update && apk add git make gcc
+RUN go get -d golang.zx2c4.com/wireguard \
+ && cd /go/src/golang.zx2c4.com/wireguard \
+ && rm donotuseon_linux.go \
+ && make install
+
+ENV WG_I_PREFER_BUGGY_USERSPACE_TO_POLISHED_KMOD=1
+
+COPY entrypoint.sh /
+
+WORKDIR /app
+
+ENTRYPOINT [ "/entrypoint.sh" ]

tests/e2e.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+
+set -e
+
+if [ ! -x ./wesher ]; then 
+    echo "Building wesher for e2e tests"
+    # build inside container to ensure same libc (image is alpine-based)
+    docker run --rm -v $(pwd):/app -v ${GOPATH}/pkg/mod:/go/pkg/mod --entrypoint="" costela/wesher-test go build
+fi
+
+declare -A started_containers
+
+cleanup() {
+    if [ ! -z "${started_containers[@]}" ]; then
+        echo "Stopping all remaining containers: ${started_containers[@]}"
+        docker container rm -f ${started_containers[@]}
+    fi
+    echo "Removing shared network"
+    docker network rm wesher_test
+}
+
+docker network create wesher_test
+trap cleanup EXIT
+
+run_test_container() {
+    local name=$1
+    echo "Starting $name"
+    shift
+    local hostname=$1
+    shift
+    docker run -d --cap-add=NET_ADMIN --name ${name} --hostname ${hostname} -v $(pwd):/app --network=wesher_test costela/wesher-test "$@"
+    started_containers[$name]=$name
+}
+
+stop_test_container() {
+    echo "Stopping $1"
+    docker container rm -f $1
+    unset started_containers[$1]
+}
+
+test_3_node_up() {
+    run_test_container test1-orig test1 --init
+    run_test_container test2-orig test2 --join test1-orig
+    run_test_container test3-orig test3 --join test1-orig
+
+    sleep 3
+
+    docker exec test1-orig ping -c1 -W1 test2 || (docker logs test1-orig; docker logs test2-orig; false)
+    docker exec test1-orig ping -c1 -W1 test3 || (docker logs test1-orig; docker logs test3-orig; false)
+
+    stop_test_container test3-orig
+    stop_test_container test2-orig
+    stop_test_container test1-orig
+}
+
+for test_func in $(declare -F | grep -Eo '\<test_.*$'); do
+    echo "--- Running $test_func:"
+    $test_func
+    echo "--- OK"
+done

tests/entrypoint.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -e
+
+mkdir -p /dev/net
+mknod /dev/net/tun c 10 200
+
+wireguard-go wgoverlay
+export WESHER_E2E_TESTS=1
+
+/app/wesher --log-level debug --cluster-key 'ILICZ3yBMCGAWNIq5Pn0bewBVimW3Q2yRVJ/Be+b1Uc=' "$@"